I remember someone posted the link to the last time Nine Inch Nails let Garageband users remix their previous single...they're doing it again with their new single "Only," but thankfully this time they're letting ACID and Protools users get in on it as well.

Catch is you have to register at NIN's website to get them, but it's not that big of a deal. Don't even have to activate through an email, once you register (could just enter a fake email if you want) you'll be taken to a download page.